How to Make high quality Gold Bar & Bullion -Vacuum gold bar casting machine

How to Make high quality Gold Bar & Bullion -Vacuum gold bar casting machine

Background:

Gold is a permanent substance, and its value has been recognized internationally, so it has played an important economic role since ancient times! As we all know, the most important value of investing in gold lies in the “eternal value” that will not evaporate from the world and will never disappear. In the current world of ultra-long-cycle inflation, for most ordinary investors, investing in gold is undoubtedly better than stocks. Safer and the best way to resist risks.

Investing in gold bullion has become the best choice for many investors. From an investment perspective, investing in gold bullion is based on international gold prices with a small amount of handling fees. The most important thing is to withdraw physical objects to reduce investment risks. With the strong gold bull market Trend, win in stability.

There are currently two main ways to make gold bars in the market, the traditional gold bar casting method and the vacuum gold bar casting method.

Traditional gold bar casting method:

Vacuum gold bar casting method:

Now let us talk in details about the Traditional gold bar casting method:

Even though some customers  still resort to gas-fired melting, gold  medium-frequency induction furnaces are currently the most widely used and popular method of melting gold because of the rapid melting speed and operation is more convenient for the users

Next, let’s take a look at the specific process of how to make high-quality mirror-finished gold bars or silver bars.

Step 1: Make the gold or silver grains

The  metal granulator  refers to the equipment  that can make gold or silver into particles of uniform size. The working principle of the granulator is to adopt the intermediate frequency induction heating to melt the precious metals that need to be pelletized to quickly dissolve,  the bottom of the molten graphite crucible is drilled with  many small holes . The smelted  metal flows into the water tank through these small holes,  so that gold particles of the same size and specifications are made. CDOCAST granulator also designed with argon protection device, for some easily oxidized metals, inert gas protection can protect precious metals from oxidation.]

After obtaining the desired gold or silver grains, you can conveniently weigh them and put them into the graphite mould of the vacuum casting machine. (If you put a large piece of gold or silver block, due to thermal expansion and contraction, the expanded gold nugget will easily squeeze out the cracks of the graphite mould and damage the mould)

Step2：Vacuum gold & silver bar casting machine

Put the weighed gold or silver grains into the graphite mold, and we can start  the process to  cast the gold or silver bars. First, use thecustomized graphite clip to put the graphite mold with the gold particles into the cooling plate, the cooling  plate is designed to be square  And same  size and shape of the graphite mold, and the cooling plate can automatically rise and fall. After the graphite mold is well placed, the cooling plate will automatically drop to the position of the induction coil and ready to melt, At this time, we have to close the furnace door and vacuumize the full melting  chamber  to prepare for melting and casting.

The entire smelting is carried out in a high vacuum environment, The entire melting process  is carried out in a high vacuum environment, and the advanced induction  heating technology allows the entire smelting process to be completely in about 6 minutes. During This melting process does not require manual operation which  can save labour for users. After the smelting is completed, it  will automatically  rush into the inert gas protection and cool down. Considering the  graphite is easily oxidized in high temperature  when contact with air, it will greatly reduce the life of the graphite mold. Therefore, the entire cooling process is also carried out in a vacuum environment, which can greatly improve the life of the graphite mold.

After 7 minutes of cooling, the gold bars will be completely formed and shaped , finally you will  get a shiny gold bar without ripples.

Step 3:Stamping logos on the gold bars

CDOCASTFour column hydraulic press  is specially designed to print logos and patterns on gold bars. The four-column hydraulic press is a kind of special hydraulic oil as the working medium and the hydraulic pump as the power source. The hydraulic oil enters the cylinder/piston through the hydraulic pipeline by the force of the pump, and then there are several sets of mutually matched seals in the cylinder/piston The seals at different positions are different, but they all play a sealing role to prevent hydraulic oil from leaking. Converting hydraulic energy into mechanical energy Hydraulic transmission is a transmission method that uses hydraulic pressure to transmit power and control. The hydraulic device is composed of hydraulic pump, hydraulic cylinder, hydraulic control valve and hydraulic auxiliary components.

In addition to providing hydraulic presses, we also have a professional team that can design 3D drawings  for the die and the tools for the dies.

Feature:

1.The four-column structure is simple, economical and practical; the frame structure has good rigidity, high precision and strong anti-fraud load ability.

2.The hydraulic control adopts an integral cartridge valve set system, which reduces leakage points, reliable action and long service life.

3.The electrical system controlled by PLC which is compact, sensitive, reliable, and flexible.(PLC control system is optional purchase)

4.The working pressure and stroke can be adjusted within the specified range according to the process requirements, and the operation is simple.

Step 4: Dot peen number marking machine to mark serial numbers

Pneumatic marking machine is a computer-controlled printing needle that moves in a certain trajectory in the X and Y two-dimensional planes, while the printing needle makes high-frequency impact motion under the action of compressed air, thereby printing a certain depth of mark on the workpiece. Main features of pneumatic marking machine: It has a large depth, direct marking output through the computer, and the marking is neat and clear; the main typical applications: automobile and motorcycle parts, instruments, machinery, automobiles, signs and other industries.

By inputting the content of serial number to be printed into the computer, the computer marking software converts the content  into digital control signals, transmits them to the controller, and drives the printing to print characters and graphics composed of continuous dot matrix on the workpiece; the needle is at X －Y two-dimensional plane moves according to the set trajectory, and the printing needle prints a concave mark composed of dense dot matrix on the surface of the workpiece under the action of compressed air.

The advantage of pneumatic marking machine is to realize online printing on higher hardness metals through dot matrix